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The Clearinghouse comes up constantly in carrier-vetting conversations, but most brokers have never actually seen one — because they usually can't. It's a federal database of CDL and CLP holders' drug and alcohol program violations, and access to it is restricted to the driver's own FMCSA-regulated employer, not to freight brokers. Here's what it tracks, who can query it, and what that means for how you vet a carrier.
The FMCSA Drug & Alcohol Clearinghouse is a federal database, live since January 6, 2020, that records drug and alcohol program violations — positive tests, refusals to test, and 'actual knowledge' violations — for commercial driver's license (CDL) and commercial learner's permit (CLP) holders. It is not a public lookup: only a driver's own FMCSA-regulated employer, the driver themselves, and a handful of other permitted parties (State Driver Licensing Agencies, C/TPAs acting on an employer's behalf) can query a given driver's record, and every query requires the driver's consent. A freight broker who does not itself employ CDL drivers generally cannot query it directly.
The Drug & Alcohol Clearinghouse is a real-time database, operated by FMCSA under 49 CFR Part 382 Subpart G, that has been live since January 6, 2020. Every time a CDL or CLP holder tests positive for drugs or alcohol under FMCSA's testing program, refuses a required test, or is found by their employer to have used drugs or alcohol on the job (an 'actual knowledge' violation), that record gets reported into the Clearinghouse.
It exists to close a gap that predated it: before 2020, a driver who failed a drug test or refused one at Carrier A could quit and get hired at Carrier B the next week with no way for Carrier B to know. The Clearinghouse gives every FMCSA-regulated employer a single federal record to check instead of relying on the driver's own disclosure or a call to a previous employer.
The Clearinghouse tracks FMCSA drug-and-alcohol-testing-program violations for CDL/CLP holders — full stop. It does not contain general criminal records, non-CMV DUI convictions, moving violations, or anything from a state licensing agency's own file. A clean Clearinghouse record says nothing about a driver's crash history or driving record.
Access to a specific driver's Clearinghouse record is tightly restricted. The parties who can query it are: the driver's own FMCSA-regulated employer (or a Consortium/Third-Party Administrator, C/TPA, acting on that employer's behalf), the driver themselves for their own record, State Driver Licensing Agencies for CDL issuance purposes, and a few other permitted parties acting within a specific regulatory role.
A freight broker is not on that list unless the broker is itself an FMCSA-regulated motor carrier that directly employs CDL drivers. Most brokers arrange transportation but don't employ the driver behind the wheel, so they have no query right at all — not even with the driver's consent. This is the single biggest misconception brokers have about the Clearinghouse: it isn't a lookup tool brokers can add to their vetting stack the way SAFER or a SAFER-derived tool is.
Employers run two kinds of queries, and they return very different amounts of detail. A limited query only tells the employer yes or no — whether the Clearinghouse has any resolved or unresolved violation on file for that driver — without releasing the violation detail itself. A limited query satisfies the annual query requirement and only needs the driver's general consent, obtained once outside the Clearinghouse system (it doesn't need to be renewed every year).
A full query returns the actual violation detail: the type of violation, the date, and whether the driver has completed the return-to-duty process. Full queries are required before hiring a CDL driver (the pre-employment query) and require the driver's specific electronic consent inside the Clearinghouse system at the time of the query — a driver has to actively grant it, not just have granted general consent in the past. Queries run at a flat per-query fee (roughly $1.25 as of this writing, set by FMCSA and subject to change) paid by the querying employer.
Employers don't just query the Clearinghouse — they're also required to report into it. When an employer obtains actual knowledge of a violation, or a driver tests positive or refuses a test, the employer must report the record to the Clearinghouse by the close of the third business day after learning of it.
Once a violation is on record, federal rule prohibits the driver from performing any FMCSA-covered safety-sensitive function — driving a CMV, most of all — until they complete the full return-to-duty (RTD) process: evaluation by a DOT-qualified Substance Abuse Professional, any treatment the SAP recommends, a negative return-to-duty test, and a follow-up testing plan. A carrier that keeps a driver with an unresolved Clearinghouse violation on FMCSA-covered duty is itself out of compliance, independent of whatever the driver's own record shows.
A driver can legitimately show no Clearinghouse record for reasons that have nothing to do with a clean history — a very recent violation may not have cleared the 3-business-day reporting window yet, and pre-2020 conduct was never entered at all. Treat a clean query as a snapshot, not a lifetime guarantee.
KnowHaul does not show — and cannot show — any per-driver or per-carrier Clearinghouse data. Query access is legally restricted to the driver's employer and a small set of permitted parties, and that consent-gated access can't be replicated by a third-party lookup tool, however it's built. What KnowHaul does surface is the aggregate national picture FMCSA itself publishes monthly: cumulative-since-2020 counts of unique drivers queried, drug-related violations, and alcohol-related violations, shown as a sourced reference card on the public /trends page.
For actual vetting purposes, the practical move is to ask the carrier directly for their own Clearinghouse compliance documentation — proof of an annual query, or a written attestation of compliance — as one line item in the broader document request you make before tendering a load, alongside authority, insurance, and safety-rating checks.
Generally no. Query access is restricted to the driver's own FMCSA-regulated employer (or a C/TPA acting on that employer's behalf), the driver themselves, and a few other permitted parties like State Driver Licensing Agencies. A broker that doesn't itself employ CDL drivers has no query right, even with the driver's consent.
A limited query only returns yes or no — whether the Clearinghouse has any violation on file — without detail, and it satisfies the annual query requirement using standing general consent. A full query returns the actual violation detail and requires the driver's specific electronic consent at the time of the query; it's required before hiring a CDL driver.
Actual knowledge means the employer has direct evidence a driver used drugs or alcohol — direct observation of use itself (not just behavior that would justify reasonable-suspicion testing), a traffic citation for driving a CMV under the influence, information from a previous employer, or the driver's own admission. It's reportable to the Clearinghouse the same as a positive test or a refusal.
A violation stays on record — and the driver stays prohibited from safety-sensitive duty — until the driver completes the full return-to-duty process: evaluation by a DOT-qualified Substance Abuse Professional, any recommended treatment, a negative return-to-duty test, and a follow-up testing plan. There's no fixed expungement timeline; completion of the process is what clears it.
No. Per-driver Clearinghouse data requires licensed query consent that only the driver's employer holds, and that's out of scope for any third-party tool, including KnowHaul. KnowHaul surfaces only the aggregate national monthly totals FMCSA itself publishes (drivers queried, drug violations, alcohol violations) as a sourced reference on the /trends page — never anything tied to an individual driver or carrier.
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